What is DMA and IOMMU ? How DMA and IOMMU used ? What if architecture does not support IOMMU ? How to use DMA without IOMMU ?

To check if Intel's VT-X or AMD's AMD-V is enabled in the BIOS/UEFI, I use: if systool -m kvm_amd -v &> /dev/null || systool -m kvm_intel -v &> /dev/null ; then echo "AMD-V / VT-X i...

I'd like to verify on any given Linux machine if PCI passthrough is supported. After a bit of googling, I found that I should rather check if IOMMU is supported, and I did so by running: dme...

I've been reading about IOMMU support in Linux and have some questions regarding page tables in IOMMU: Does the IOMMU uses the CPU MMU page tables for storing the VA → PA mapping? ...

NOTE: if you have an AMD A55 chipset on a motherboard that support IOMMU, please send me a copy of your /sys/firmware/acpi/tables/DMAR (or whatever the name is that describes IOMMU). There is no ri...

One of my customers had a problem with a Xeon E5 machine: they were having one gpu (I believe it was an NVIDIA one) hanging and they solved by adding the intel_iommu = igfx_off in the grub loade...

Does the Linux kernel provide a CPU flag in /proc/cpuinfo that indicates the processor supports Intel vPro technology? Specifically, I'd like to tell from within the operating system if the physica...